GWA-11(60) Stokes Mortar Crew
The Stokes mortar was a simple weapon, consisting of a smoothbore metal tube fixed to a base plate (to absorb recoil) with a lightweight bipod mount. When a mortar bomb was dropped into the tube, an impact sensitive primer in the base of the bomb would make contact with a firing pin at the base of the tube, and detonate, firing the bomb towards the target.
British Empire units had 1,636 Stokes mortars in service on the Western Front at the Armistice.
In World War I, the Stokes Mortar could fire as many as 25 bombs per minute and had a maximum range of 800 yards firing the original cylindrical unstabilized projectile. By World War II, it could fire as many as 30 bombs per minute, and had a range of over 2,500 yards with some shell types